<template>
  <div ref="editor"></div>
</template>

<script>
import Quill from "quill";
import "quill/dist/quill.core.css";
import "quill/dist/quill.snow.css";
import "quill/dist/quill.bubble.css";
export default {
  name: "HTMLEditor",
  props: {
    value: {
      type: String,
      required: false,
      default: ""
    }
  },
  data() {
    return {
      Quill: undefined,
      currentValue: "",
      options: {
        theme: "snow",
        bounds: document.body,
        debug: "warn",
        modules: {
          toolbar: [
            ["bold", "italic", "underline", "strike"],
            ["blockquote", "code-block"],
            [{ list: "ordered" }, { list: "bullet" }],
            // [{ 'script': 'sub' }, { 'script': 'super' }],
            // [{ 'indent': '-1' }, { 'indent': '+1' }],
            // [{ 'direction': 'rtl' }],
            [{ size: ["small", false, "large", "huge"] }],
            [{ header: [1, 2, 3, 4, 5, 6, false] }],
            [{ color: [] }, { background: [] }],
            // [{ 'font': [] }],
            [{ align: [] }],
            ["clean"],
            ["link", "image"]
          ]
        },
        placeholder: "书写你的内容",
        readOnly: false
      }
    };
  },
  watch: {
    value: {
      handler(val) {
        // 确认是新的值
        if (val !== this.currentValue) {
          this.currentValue = val;
          // 尝试更新
          if (this.Quill) {
            this.Quill.pasteHTML(this.value);
          }
        }
      },
      immediate: true
    }
  },
  mounted() {
    this.init();
  },
  methods: {
    init() {
      const editor = this.$refs.editor;
      // 初始化编辑器
      this.Quill = new Quill(editor, this.options);
      // 默认值
      this.Quill.pasteHTML(this.currentValue);
      // 绑定事件
      this.Quill.on("text-change", (delta, oldDelta, source) => {
        const html = this.$refs.editor.children[0].innerHTML;
        const text = this.Quill.getText();
        const quill = this.Quill;
        // 更新内部的值
        this.currentValue = html;
        // 发出事件 v-model
        this.$emit("input", html);
        // 发出事件
        this.$emit("change", { html, text, quill });
      });
      // 将一些 quill 自带的事件传递出去
      this.Quill.on("text-change", (delta, oldDelta, source) => {
        this.$emit("text-change", delta, oldDelta, source);
      });
      this.Quill.on("selection-change", (range, oldRange, source) => {
        this.$emit("selection-change", range, oldRange, source);
      });
      this.Quill.on("editor-change", (eventName, ...args) => {
        this.$emit("editor-change", eventName, ...args);
      });
    }
  }
};
</script>
